Gotcha!

Gotcha! is the party game that breaks all the rules. In Gotcha!, each player tries to follow the constantly changing rules, while at the same time trying to catch others breaking a rule. For example, a rule card may read, "People wearing jeans must use finger quotes while speaking." If any jeans-wearer speaks without using finger quotes, the first player to catch it and hit the buzzer scores! The rule cards have been designed so there are thousands of different possible rule combinations, offering great replayability and making each game different. The more rules that are played, the funnier the game gets. Catch your friends before they catch you!

(from manufacturer's website)